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Experimental testing and model validation of the calcination of calcium carbonate by the reduction of copper oxide with CH4

AuthorsFernández García, José Ramón ; Abanades García, Juan Carlos
KeywordsCO2 capture
Chemical looping
Calcium looping
H2 production
CaCO3 calcination
CuO reduction
Issue Date1-Sep-2018
CitationChemical Engineering Science 193: 120-132 (2019)
AbstractThe reduction reaction of copper oxide with CH4 is highly exothermic and can be arranged to generate sufficient heat to in-situ calcine calcium carbonate and produce a highly concentrated stream of CO2. This concept is tested at TRL4 in a packed-bed reactor operated close to adiabatic conditions. The impact of the initial solids temperature and the inlet flowrate of the gases is evaluated. A 50/50 (vol.%) mixture of methane and hydrogen (i.e., a possible composition of the PSA-off gas generated in a reforming process) has also been used as reducing gas. The presence of H2 reduces the CuO/CaCO3 proportion required in the bed and promotes the calcination at temperatures lower than 870 °C. The experimental measurements are well predicted by a one-dimensional fixed-bed reactor model, in which the steam methane reforming, water–gas-shift, carbon deposition and carbon gasification reactions are also considered. Different characterization techniques (i.e., SEM, XRD, N2 adsorption, TPR) demonstrate that both commercial CuO- and CaO-based materials show good stability after successive cyclic experiments.
Publisher version (URL)https://doi.org/10.1016/j.ces.2018.09.001
Appears in Collections:(INCAR) Artículos
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